Messages in this thread | | | Subject | Re: [PATCH v4 1/5] getcpu_cache system call: cache CPU number of running thread | From | "H. Peter Anvin" <> | Date | Mon, 29 Feb 2016 10:19:17 -0800 |
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On February 29, 2016 4:41:49 AM PST, Mathieu Desnoyers <mathieu.desnoyers@efficios.com> wrote: > >Agreed that many architectures issue slower instructions when reading >from packed structures, which is unwanted. >
And detrimental to atomicity.
>Could we require that each field be naturally aligned and require that >they are placed so _no_ padding whatsoever should ever be added by the >compiler ? If that's possible, then we could remove the packed.
What people have been trying to tell you is that we *must* do this, and no compiler truck like packed will help.
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